Edwin densmoee



(No Model.)

. E. DENSMORE.

VENEEB. CUTTING MACHINE.

Patented May 1, 1.888.. I

N. PETERS. Photo-Lilhngmpher. wnshingm". n. C.

UNITED STATES PATENT OFFICE.

EDWIN DENSMORE,AOF GRAND RAPIDS, MICHIGAN, ASSIGNOR TO W'M. T.

POWERS 85 SON, OF SAME PLACE.

VENEER-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 382.219. dated May 1, 1888.

Application filed July 2S, 1887. Serial No. 245,537. (No model.)

.To aZZ whom, it may concern: Beit known that I, EDWIN DENSMORE, of Grand Rapids, in the county of Kent and State of Michigan, have invented a new and useful Improvement in Veneer Cutting Machines; and I do hereby declare that the following is a full, clear, .and exact description of the same. My invention relates to machinery designed for cutting Veneers, and is an improvement in the mechanism `employed .for regulating the movement of the cutting-knife.

The object of my invention is to provide such mechanism as will permit the operator to change quickly and accurately the movement of the knife to a greater or less degree in order that veneers of any desired thickness maybe produced. This result is ordinarily accomplished by means of shifting the driving-belt to a larger or smaller pulley, or by changing the driving-gears. I aim to secure greater accuracy in the work and a more extensive range of adjustment than is provided by the means above referred to.

With these objects in view my invention consists, broadly, of mechanism for giving the cutting-knife the necessary lateral movement, in combination with an adjustable connection between said mechanism and the drivingpower, whereby the movement of the drivingshaft may be imparted to the knife-moving mechanism to a greater or less degree.

The invention consists, further, of the knifemoving mechanism, of suitable devices for operating the said mechanism, and of pitmen for operating the latter, said pitmen being adapted to be adjusted toward and from the center of their rotary supports, whereby the strokes of the said pilmen may be varied at the will of the operator to change the movement of the knife, and consequently the thickness of the veneer.

The details of construction which enable me to carry out my objects successfully and to apply the improvement to machines already built also form an essential part of this invention.

In the accompanying drawings is shown only so much of aveneer-cutting machine as will be necessary to a clear understanding of the present invention.

The machine to which I have applied my improvement is the same in all essential particulars as that shown in Letters Patent granted to me on the 17th of August, 1886, No. 34.7 .331. Y

Figure 1 is a side elevation showing a portion of the machine and my improvement attached thereto. Fig. 2 is a plan view of a portion of the machine, and Fig. 3 is a front view of the same.

In the drawings, F represents the knife,` and I the knife-bar. The latter is provided on either side with a pendent block, J, one only being shown, each of which is in engagement with an operating-screw, O, whereby the necessarylateral movement is imparted to the knife to perform the cutting operation. The log from which the veneers are to be cut is secured between the clutches, one only of which is shown, on the rotating shafting T, asin my patent aforesaid. Power is applied to drive this shaft through the large gear 'I", which is in turn driven from the shaft t by the intermediate pinion, f2; The operating-screws are `driven from the shaft P through the beveled gears, as shown. I attach my improved mechanism to the shafts P and T. In the space between the bearing of the shaft T, on one side of the machine, a drivinggear-Wheel, a, is secured. This meshes with a pinion, b, keyed to a small shaft, B, which is suitably supported from the base 0f the machine by va standard, I-I. Upon this shaft are fixed also two crank wheels or disks, c c. The shaft P carries fixed thereto ratchetwheels E E, these being secured at a distance apart slightly greater than the distance between the disks c c. Each ratchet-wheel has engaging with it two pawls, 2 3, which are carried upon the ends of arms F G. The pawls and arms are arranged upon opposite sides of the shaft P, and are adapted to act each independent of the other. Movement is imparted to the pawls by means of pitmen F L, driven from the disk c. In the face of each disk c a groove or channel, 5, is formed running from the periphery to or past the center. groove is beveled and is adapted to receive a block, 7, which carries the crank-pin D. The pitmen li" and L, which, as above stated, drive the pawl-arms upon opposite sides ofthe ratchets, are connected to the crank-pin D. It will This f IOC thus be seen t-hat in the revolution of the crank wheels or disks the pawls will be alternately pushed and pulled, thus imparting a cont-inuous movement to the ratchet-wheels and shaft P. In order that the movement of the said shaft may be more even and positive, I make the connections between one disk and its ratchet a quarter-turn from the connections between the other set of devices, so that while the crankpin of one set is passing the line of the shafts B and P the crank-pin of the other set will be making its full effect upon the pitmen.

The device by 4which the movement of the shaftis regulatedto any desired degreeis shown at m m, and consists of the elongated screw having suitable bearings at its ends in the disks c. This screw passes directly through thc block 7, and it will be apparent that by turning the screw either one way or the other the block will be caused to travel toward or from the center, and the stroke of the pitmen will be accordingly decreased or increased to any degree desired. By this mechanism I am enabled to make the most accurate adj nstment of the movement, and the degree thereof may be extremely slight or great, according to the will of the attendant.

If desired, a suitable scale and index may be attached to the disk and block, whereby the operator can tell just how much to move the block in `one direction or the other to effect any movement in the knife. This arrangement'ofoperating parts enables me to apply the improved mechanism to the form of machine referred to heretofore without change therein.

Obviously crank-arms may be substituted for the crank-wheels shown.

. I claim as my invention-- 1. In a veneercutting machine, and in combination, the holder, as I, for the material, the cutting knife, means, substantially as described, for giving movement to the same, a'

driving-shaft, and adjustable connections from said shaft to the knife-moving mechanism,

. whereby the knife may be advanced against the work to a greater or less degree relative to the movement of the holder, substantially as described.

2. In combination, the knife, the. crankwheel, the pitman, and the screw for moving the connecting-point of said pitman toward and from the center of the crank-wheel, and

of the pitman to the knife, substantially as de-V scribed.

3. In combination, the cutting-knife, the crank-wheel provided with a groove in its face, the crank-pin or stud adapted to move insaid groove, the screw engaging said crank-pin, knife-moving mechanism, as E P O, and the pitmen, substantially as described.

4. In combination, the knife, the crankwheel, the adjustable pitman connected'with said crank-wheel, whereby the stroke may be varied, the pawl-aud-ratchet mechanism operated by the pitman, and the mechanism, substantially as described, for imparting the move ment of the ratchet mechanism to the knife, substantially as described.

' 5. In combination, the knife, the crankwheel, the ratchet-Wheel, the push and pull pawls, and the adjustable pitmen operating said pawls and causing them to act alternately upon the ratchet-wheels, and mechanism, substantially as described, for communicating the movement of the ratchet mechanism to the knife, substantially as described.

6. In combination, the knife, the crankwheel, the ratchet-wheel, the push and pull pawls, the pitmen for operating the said pawls, and adjustable crank-pins, both of said pitmen being secured directly thereto, substantially as described.

7. In combination, the knife, the crank wheels .or disks c c, the ratchet-wheels, the pawls,andthepitmen foroperatingsaid ratchet mechanism, the pitman of one crank-wheel being positioned a quarter-turn from the pitman of the other crank-wheel, substantially as described.

8. In combination, the knife, the shaft I, the driving-gear a, placed thereon, the supplemental shaft B, the pinion b, supported by said shaft and meshing with gear a, the disk c on 9 said shaft, the mechanism, as E P O, for driving the knife, and adjustable connection between said mechanism and the disk, substantially as described. v

In testimony whereof Ihave signed my name to this specication in, the presence of two subscribing witnesses.

EDWIN DENSMORE.

Witnesses:

GYRUs E. PERKINs, ELLA P. SHUsTER.

ICC 

